This is the first of 2 volumes, and focuses on fundamentals and good practices, but still goes into detail about objects, collections, and more.
Ranked in these QuestionsQuestion Ranking
Pro Very thorough
It really does cover the whole language. If you read both volumes, consider yourself a Java expert.
Pro Both a tutorial and a reference
It's well-written enough to read cover-to-cover, and well organized enough to make a good reference.
Pro Up to date contents
This book explains Java 8, which is the most recent version of Java.
This is a weighty tome at over a thousand pages, and that's just Volume 1. Don't expect to read it overnight.